* fix: use sync get_state() for SqliteSaver in chat routers
Replace async aget_state() calls with sync get_state() wrapped in
asyncio.to_thread() to fix SqliteSaver compatibility issues.
SqliteSaver does not support async methods, so we need to run
the sync version in a separate thread.
This is a follow-up to #519 which fixed the same issue in
graph_utils.py but missed four locations:
- chat.py: get_session() and execute_chat()
- source_chat.py: get_source_chat_session() and stream_source_chat_response()
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* chore: translate comments to English
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Luis Novo <lfnovo@gmail.com>
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